Synthesis Method

σRT (Ω−1cm−)

Transition

Temperature K

∆E (eV)

Temperature

∆E determined

References

Solution Growtha)

3.5 × 10−4

395

0.43

Room temperature

54

Diffusion Methodb)

1.0 × 10−4

400

0.42

Room temperature

55

Solution Growthc)

-

381

-

-

12

Solution Growthd)

2.0 × 10−4

-

-

-

65

Solution Growthe)

5.0 × 10−7

373

0.43

Room temperature

11

Diffusion Methodf)

1.0 × 10−4

391.6

0.45

Room temperature

56

Solution Growthg)

1.0 × 10−4

394

-

-

66

Solution Growthh)

2.4 × 10−4

120

0.1

Room temperature (300)

Our results

270

0.078

50 - 100

380

0.032

265 - 270

470

0.13

380 - 450

Diffusion Methodh)

2.5 × 10−4

120

0.09

Room temperature (300)

Our results

270

0.076

50 - 100

380

0.030

265 - 270

470

0.12

380 - 450

Electrochemicalh)

7.0 × 10−1

270

0.06

Room temperature (300)

Our results

0.086

50 - 100

0.069

265 - 270

0.048

380 - 450

0.12

Above 450